Raining, pedestrians trample or the dust in the air can bring stains and dirt to the outdoor platform surface.  The machine oil and the tire traces of the vehicles can make the floor of parking lot dirty.  In order to maintain the cleanliness and hygiene of the outdoor platform and the parking lot floor, we will base on the floor condition, to use the high-pressure water gun or the high-speed washing machine with the high-performance cleaning detergent to wash the dirt and the stains in order to resume the cleanliness and the hygiene of the floor.